Where does “sandstormur” come from?

sandstormur (Icelandic) comes from Icelandic sandur, from Old Norse sandr, from Proto-Germanic samdaz, from Proto-Indo-European sámh₂dʰos, from Proto-Indo-European sem- — together, one.

sandstormur (Icelandic): sandstorm (strong wind carrying clouds of sand)

Definitions

sandstorm (strong wind carrying clouds of sand)

Ancestry of “sandstormur”, step by step

sandstormur traces back through two separate lines of ancestry.

via Icelandic sandur

Step	Language	Word	Meaning
1	Icelandic	sandur	sand
2	Old Norse	sandr	sand; sandbanks, sands, sandy ground
3	Proto-Germanic	samdaz	sand
4	Proto-Indo-European	sámh₂dʰos	sand
5	Proto-Indo-European	sem-	together, one

via Icelandic stormur

Step	Language	Word	Meaning
1	Icelandic	stormur	storm
2	Old Norse	stormr	storm
3	Proto-Germanic	sturmaz	storm
4	Proto-Indo-European	(s)twer-	to rotate, swirl, twirl, move around; to turn...

Every word from Proto-Indo-European sem- →Every word from Proto-Indo-European sámh₂dʰos →Every word from Proto-Germanic samdaz →